Pump anchor



Sept. 15, 1936.

D. W. HOFER-ER PUMP ANCHOR /Filed April 26,. 1955 5 rfv Patented Sept. 15, 1936 UNITED STATES PATENT OFFICE PUMP ANCHOR Daniel W. Hoferer, Long' Beach, Calif.

Application April 26, 1935, Serial No. 18.455 3 Claims. (Cl. 10S- 219) v This invention relates toy well pumps and relates more particularly to anchors for connecting the stationary elements of the reciprocating type of well pumps with the pump tubing. A general A5 object of the present invention is to provide a simple, practical dependable pump anchor.

The stationary elements of the reciprocating type of oil well pumps are releasably or removably connected with the tubing by devices known as l anchors. Pump anchors are usually provided with packing rings of lead, babbitt or the like for sealing with the tapered seats in the shoes on the lower ends of the tubing. The s oft metal packing rings soon become worn and damaged to l the extent that they must be replaced or repaired. In the usual types of anchors special tools and equipment are required to replace the packing parts and it is usually necessary to take the anchors to shops to repair and recondition them.

.20 Further, the soft metal packing rings of anchors sometimes become displaced and lost in the wells when the pumps are removed.

Another object of this invention is to provide a pump anchor embodying an eiective packing ,25 part that may be easily replaced at the well'derrick or pump house without special tools or equipment. I Y

Another object of the invention is to provide a pump anchor embodying a simple inexpensive 430 packing part that forms a perfect seal with the shoe.

Another object of the invention is to provide an anchor having a sealing part that can be refaced from time to time as conditions may Arequire to accurately and properly seal with the shoe.

Another object of the invention is to provide a pump anchor embodying a replaceable packing ring that is dependably held on the anchor body so that it cannot become displaced and cannot remain in the shoe when the pump and anchor are removed from the well.

A further object of the invention is to provide a pump anchor of the character mentioned that is dependable and long wearing and that is inexpensive of manufacture.

The various objects and features of my invention will be fully understood from the following detailed description of a typical preferred form and application of the invention, throughout which description reference is made to the accompanying drawing, in which:

Fig. 1 is a side elevation of a typical pump in position in a tubing illustrating the anchor provided by this invention connecting the stationary pump part with the tubing and shoe. Fig. 2 is an enlarged vertical detailed sectional view taken substantially as indicated by line 2-2 on Fig. l. Fig. 3 is a side elevation of the member for coupling the anchor body with the pump part. Fig.

4 is a side elevation of the nut for retaining the `5 sealing ring in place. Fig. 5 is a side elevation of the sealing ring and Fig. 6 is a side elevation of the anchor body with the other parts removed.

The pump anchor provided by the present invention may be applied to or used in connection 10 with well pumps of various types. In the drawing I have illustrated my improved anchor employed in connection with a more or less typical oil well pump having a relatively stationary plunger and a reciprocating barrel. It is to be under- 15 stood that the invention is not to be construed as limited to the particular use or application illustrated in the drawing and about to be described.

The typical pump structure illustrated in the drawing include a reciprocable barrel I 0 and a 20 stationary plunger IIV entering the lower end of the barrel I0. The pump is arranged longitudinally in a pump tubing or oil tubing T. A typical seat member or shoe I2 is provided on the lower end of the tubing T to carry the stationary plunger II. The shoe I2 is a tubular member threadedly connected with the lower end of the tubing T to project downwardly therefrom. A downwardly and inwardly tapered seat I3 is formed in the upper end portion of the shoe I2. An annular internal ilange I4 is provided in the lower end portion of the shoe I2. An operating rod or sucker rod I5 is connected With the upper end of the barrel I0 by the cage I6 of a 35 working valve. A nut or coupling I'I is threaded on the lower end of the plunger II below the lower end of the barrel I0 and a guide I8 is provided on the lower end of the barrel to slidably engage the plunger. The anchor of the 40 present invention releasably or detachably connects the lower end of the plunger Il with the shoe I2.

The anchor provided by this invention includes, generally, a mandrel or body 20 adapted to be inserted in the shoe I2 to connect therewith, a packing or sealing ring 2| on the body 20 for sealing with the seat I3, and means- 22 for removably retaining the ring 2| in place and for attaching 50 the body 20 to the plunger I I. Y

The anchor body 20 is an elongated tubular member having a central longitudinal opening 23 extending through it from one end to the other. VThe body 20 is in the nature of a prin or -55 mandrel to be'inserted in the shoe I2. An enlargement or head 24 is provided on the lower end of the body 20. The lower end vor side of the head 24V has a rather gradually tapered surface while the upper end 25 of the enlargement 24 is more abrupt. The lower end portion of the body 2U is longitudinally slit being provided with spaced longitudinal slots orV cuts 26. 'I'he cuts 26 make the lower portion of the body 2|] flexible so that it may contract when the head .24 is forced or =passedthrough the flange I4 and the resiliency of the body tends to return it to its original size and configuration so that the upper end 25 of the head cooperates with the liangeM. to releasably lock the body 20 to the shoe I2.' The periphery or outer surface of the head `24-iengages the interior of the shoe I2 to center `the body 2D.

An annular enlargement or fiange '21 'is provided on the body 20 above the upper ends of the cuts 26. The flange 2.'I is positioned at or immediately below the lower endof .the seat |3 and its upper side forms an upwardly facing annular shoulder 2.8. The upper end por-tion .of the body 20 projecting above the .shoe |.2 is externally screw threaded and `the portion of the .body immediately below thean-ge 21 ,is knurled to indicate that it is adapted` to receive-.a wrench. The body 2-0 is preferablyformed of a non-corrosive alloy steel and heat treated.

The packing or sealing ring 2| is `carried by the body 20 to seal with the seat I3 of the shoe I2. It isva feature of the invention that the sealing ring .2| is arranged .onV the body 20 so thatit Vcannot become displaced in the well .and so that it may .be easily vand quickly removed for replacement .or repair at the well derrick or pumpv house. The ring 2| may be formed of copper, brass, lead, :babbitt or :other relatively soft metal'or may be formed of .anyother suitable sealing material. is preferred to .form the ringV 2| ofcopper or brass having a greater strengththan the lead and babbitt that has been inuse heretofore. In .accordance with the invention the ring .2 I is adapted to be arranged or .passed over the upper end of. the body 2.0 and brought to la position .against the body shoulder 28. Y 'The lower end Yof .the ring 2| is'preferably :dat and `normal to 4'evenly seat on the .shoulder 28. A downwardly and inwardly inclined. peripheral surface 30 is .provided on the ring 2| to cooperate-with the -seat I3.. The surface 30 is tapered and finished to effectively seal with the sea-tA I3. The surface 30 sealswith the major portion of the seat I3 and the sealing ring-2| is-proportioned to project upwardly from the seat I3 beyond the `upper end 'foi' the shoe :|2. In accordance with the invention thesealing ring 2| has a flat normal upper .end provided with an annular lip 3| having an upwardly and inwardly inclined outer surface.

The means v22 for retaining the sealing ring 2| in position and for connecting the body20 with the pump part or plunger AI-I in-cludes a sleeve or nut 32 threaded on the body 20 to bear against the upper end of the sealing rin-g 2 The nut 32 Vhas a .fiat normal lower end provided with an annular groove v33 to receive the lip 3|.

.around the body and provide a tight seal between -the ring 2| Yand the nut 32 and to insure a tight seal between the anchor body 20 and the interior of the upper portion of the. ring 2|.

l depend-ably lock the nut in place.

The combined weight of the sucker rod I5, the pump and the oil in tubing T is imposed on the ring 2| and the cooperation of the surface 3|) with the seat I3 forces the interior of the lower portion of the ring 2| into tight sealing engage ment with the body while the cooperation of the inclined wall of the groove 33 with the lip 3| forces the interior of the upper portion of the ring tightly inwardly against'the body 20 and retains it in thatposition. The nut 32; ls operable to hold the sealing ring 2| clamped tightly against the body shoulder 28. The nut 32 may be ikiliurled to indicatev that it is to be engaged by vsion-or'connecting member 34 threaded on the upper ,end portion of the body 20. The member 34 bears against the upper end of the nut 32 to The member 34 projects upwardly beyond theupper end of the body 20,to vconnect with thepump. In the particular application of the invention illustrated in the drawing the member v34 hasV a reduced upper end portion 35 threaded into the lower end ofthe nut or coupling I'I on the lower end of the `plu-nger `I I.

In operation the parts of the anchor are 4assembled as illustrated in Fig. 2 of the drawing and the anchor is -connected with the plunger|| by the member 34 so that the projecting lowerendof the body 20 is adapted to enter the shoe I2 when the pump is run to its position in the tubingv T. The `head 24 slips Vthrough the flange I4 to automatically -connect the anchor with the shoe I2. Whenthe anchor is in position in the shoe the surface 30 of the sealing ring 2| `evenly cooperates with the seat I3 to effectively seal therewith. The ring 2| provides an effective seal between the body 2|] and the shoe I2. 'I'he nut 32 tightly holds or retains the sealing ring 2| in its proper position on the body 20 where it tightly bears against the shoulder 28. The member 34 threaded to the upper end of the body dependably--locks the nut 32v in its ring retaining position. `The lip 3| vin cooperation with the wall of thegroove or recess 33 provides an effective seal between the ring 2| andthe body 20 and between the ring 2| and the nut 32. When it is desired to remove the pum-p from the well the operating string I5 is given an upward pull which pulls the head 24 through the flange I4. tract as the head 24 is forced upwardly through the flange I4. y

When the pump is in the derrick orrpump house the member 34 may be easily disconnected from the nut or coupling II and may be unthreaded from the body 20. The nut 32 may then be unthreaded from the body to allow the sealing ring 2| to be removed. The sealing ring 2| may be replaced by a new sealing ring or may be refaced if necessary and then reassembled on the body 20. In the form of the invention illustrated the vring 2| is not adjustable and it is a feature of the invention that the shoulder 28 is a fixed shoulder so that it is impossible to incorrectly position the ring 2| when it is replaced or afterV it has been refaced. The nut 32 is, of course, threaded down on the body 20 to properly clamp the refaced ring or replacement ring against the shoulder 28. It is believed that it will be apparent how the sealing ring 2| maybe re-assembled on the body 20 and then locked in place by the nut 32 and coupling member 34. It is to be noted that the sealing ring 2| may be easily and quickly replaced with The cuts 25 permit the body to consimple or common Wrenches. The ring 2| is such that it may be refaced several times. The sealing ring 2l in being tightly clamped between the large body shoulder 28 and the nut 32 cannot possibly become displaced in the Well. The shoulder 28 positively prevents the Sealing ring 2| from remaining in the shoe I2 when the pump is removed from the Well.

Having described only a typical preferred form and application of my invention, I do not wish to be limited or restricted to the specific form and application herein set forth, but wish to reserve to myself any modifications or variations that may appear to those skilled in the art or fall within the scope of the following claims.

Having described my invention, I claim:

1. An anchor for a well pump including, a body to be attached to a pump part and having a shoulder, a packing ring arranged on the body to engage the shoulder and operable to support the body in a shoe, a part threaded on the body to clamp the ring against the shoulder, and a separate threaded member locking said part on the body and connecting the body with the pump.

2. In combination, a shoe to be applied to a well tubing and having an internal seat, and an anchor for connecting a well pump part with the shoe including a body releasably locked in the shoe, a replaceable ring on the body bearing on the seat to seal therewith and support the anchor thereon, a nut retaining the ring on the body, and a separate threaded locking member locking the nut and means connecting the body with a. part of the pump.

3. An anchor for a well pump including a body adapted to be attached to the pump or a threaded adapter thereon, the body having a fixed shoulder, a ring of sealing material arranged on the body to bear downwardly against the shoulder, a tapered lip on the upper end of the ring, a nut threaded on the body to hold the ring against the shoulder, the nut having a tapered groove receiving the lip and holding the lip inwardly against the body, and a separate member threaded on the body locking the nut and connecting the body with a part of the pump, the ring having an inclined surface on the ring for cooperating with a seat.

DANIEL W. HOFERER. 

